Imaging lens system, camera module and electronic device

ABSTRACT

An imaging lens system includes a plastic lens element, a lens barrel and a light-absorbing coating layer. The plastic lens element is accommodated in the lens barrel and has an outer annular surface. The lens barrel includes a plate portion and a lateral wall portion. An optical axis of the imaging lens system passes through a light-passable hole of the plate portion. The lateral wall portion is connected to the plate portion and extends along a direction substantially parallel to the optical axis. The light-absorbing coating layer has an inner surface and an outer surface. The inner surface faces and is fixed on the outer annular surface of the plastic lens element. The outer surface is located opposite to the inner surface and in physical contact with the lateral portion of the lens barrel.

RELATED APPLICATIONS

This application claims priority to U.S. Provisional Application63/147,689, filed on Feb. 9, 2021, which is incorporated by referenceherein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to an imaging lens system, a cameramodule and an electronic device, more particularly to an imaging lenssystem and a camera module applicable to an electronic device.

Description of Related Art

With the development of semiconductor manufacturing technology, theperformance of image sensors has improved, and the pixel size thereofhas been scaled down. Therefore, featuring high image quality becomesone of the indispensable features of an optical system nowadays.

Furthermore, due to the rapid changes in technology, electronic devicesequipped with optical systems are trending towards multi-functionalityfor various applications, and therefore the functionality requirementsfor the optical systems have been increasing. However, it is difficultfor a conventional optical system to obtain a balance among therequirements such as high image quality, low sensitivity, a properaperture size, miniaturization and a desirable field of view.

SUMMARY

According to one aspect of the present disclosure, an imaging lenssystem has an object side, an image side and an optical axis. The imageside is opposite to the object side. The optical axis passes through theobject side and the image side. The imaging lens system includes aplastic lens element, a lens barrel and a light-absorbing coating layer.The plastic lens element has an object-side surface, an image-sidesurface and an outer annular surface. The object-side surface faces theobject side of the imaging lens system. The image-side surface faces theimage side of the imaging lens system, and the image-side surface isopposite to the object-side surface. The outer annular surface isconnected to the object-side surface and the image-side surface. Thelens barrel has an internal space for accommodating the plastic lenselement. The lens barrel comprises a plate portion and a lateral wallportion. The plate portion has a light-passable hole. The optical axisof the imaging lens system passes through the light-passable hole. Thelateral wall portion is connected to the plate portion, and the lateralwall portion extends from the plate portion along a directionsubstantially parallel to the optical axis. The lateral wall portioncorresponds to the outer annular surface of the plastic lens element.The light-absorbing coating layer is fixed on the outer annular surfaceof the plastic lens element and is in physical contact with the lensbarrel. The light-absorbing coating layer has an inner surface and anouter surface. The inner surface faces and is fixed on the outer annularsurface of the plastic lens element. The outer surface is opposite tothe inner surface, and the outer surface is located farther away fromthe outer annular surface of the plastic lens element than the innersurface. The outer surface is in physical contact with the lateral wallportion of the lens barrel. When a length of the outer surface of thelight-absorbing coating layer that is in physical contact with thelateral wall portion of the lens barrel along a direction substantiallyin parallel with the optical axis is LA, and a length of the innersurface of the light-absorbing coating layer along a directionsubstantially in parallel with the optical axis is LT, the followingcondition is satisfied:

0.1≤LA/LT≤0.95.

According to another aspect of the present disclosure, a camera moduleincludes the aforementioned imaging lens system.

According to another aspect of the present disclosure, an electronicdevice includes the aforementioned camera module and an image sensor,wherein the image sensor is disposed on an image surface of the imaginglens system.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a perspective view of an imaging lens system that is partiallysectioned according to the 1st embodiment of the present disclosure;

FIG. 2 is an exploded view of the imaging lens system in FIG. 1;

FIG. 3 is a cross-sectional view of the imaging lens system in FIG. 2;

FIG. 4 is a cross-sectional view of a seventh lens element of theimaging lens system in FIG. 3;

FIG. 5 is an enlarged view of the AA region of the imaging lens systemin FIG. 3;

FIG. 6 is an enlarged view of the BB region of the imaging lens systemin FIG. 5;

FIG. 7 is a cross-sectional view of an imaging lens system according tothe 2nd embodiment of the present disclosure;

FIG. 8 is an enlarged view of the CC region of the imaging lens systemin FIG. 7;

FIG. 9 is an enlarged view of the DD region of the imaging lens systemin FIG. 8;

FIG. 10 is an enlarged view of the EE region of the imaging lens systemin FIG. 8;

FIG. 11 is an enlarged view of the FF region of the imaging lens systemin FIG. 8;

FIG. 12 is an enlarged view of the GG region of the imaging lens systemin FIG. 8;

FIG. 13 is a cross-sectional view of an imaging lens system according tothe 3rd embodiment of the present disclosure;

FIG. 14 is an enlarged view of the HH region of the imaging lens systemin FIG. 13;

FIG. 15 is an enlarged view of the II region of the imaging lens systemin FIG. 14;

FIG. 16 is an enlarged view of the JJ region of the imaging lens systemin FIG. 14;

FIG. 17 is an enlarged view of the KK region of the imaging lens systemin FIG. 14;

FIG. 18 is a cross-sectional view of an imaging lens system according tothe 4thd embodiment of the present disclosure;

FIG. 19 is an enlarged view of the LL region of the imaging lens systemin FIG. 18;

FIG. 20 is an enlarged view of the MM region of the imaging lens systemin

FIG. 19;

FIG. 21 is a cross-sectional view of an imaging lens system according tothe 5th embodiment of the present disclosure;

FIG. 22 is a perspective view of the imaging lens system in FIG. 21 thatis partially sectioned;

FIG. 23 is a cross-sectional view of the imaging lens system in FIG. 22;

FIG. 24 is a cross-sectional view of a first lens element of the imaginglens system in FIG. 23;

FIG. 25 is an enlarged view of the NN region of the imaging lens systemin 23;

FIG. 26 is an enlarged view of the OO region of the imaging lens systemin 25;

FIG. 27 is an enlarged view of the PP region of the imaging lens systemin 23;

FIG. 28 is an enlarged view of the QQ region of the imaging lens systemin 27;

FIG. 29 is a cross-sectional view of an imaging lens system according tothe 6th embodiment of the present disclosure;

FIG. 30 is an enlarged view of the RR region of the imaging lens systemin FIG. 29;

FIG. 31 is an enlarged view of the SS region of the imaging lens systemin FIG. 30;

FIG. 32 is a perspective view of a camera module according to the 7thembodiment of the present disclosure;

FIG. 33 is a perspective view of an electronic device according to the8th embodiment of the present disclosure;

FIG. 34 is another perspective view of the electronic device in FIG. 33;and

FIG. 35 is a block diagram of the electronic device in FIG. 33.

DETAILED DESCRIPTION

In the following detailed description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of the disclosed embodiments. It will be apparent,however, that one or more embodiments may be practiced without thesespecific details. In other instances, well-known structures and devicesare schematically shown in order to simplify the drawing.

The present disclosure provides an imaging lens system that has anobject side, an image side, an image surface and an optical axis. Theimage side is opposite to the object side. The image surface is locatedclose to the image side and away from the object side, and the imaginglens system images on the image surface. The optical axis passes throughthe object side, the image side and the image surface. The imaging lenssystem includes a plastic lens element, a lens barrel and alight-absorbing coating layer.

The plastic lens element has an object-side surface, an image-sidesurface and an outer annular surface. The object-side surface faces theobject side of the imaging lens system. The image-side surface faces theimage side of the imaging lens system, and the image-side surface isopposite to the object-side surface. The outer annular surface isconnected to the object-side surface and the image-side surface.

The plastic lens element can include at least one axial connectionstructure located on at least one of the object-side surface and theimage-side surface. The axial connection structure is configured to beconnected to an adjacent optical element, and the axial connectionstructure is configured to align the adjacent optical element with theoptical axis by abutting a tapered surface thereof on the adjacentoptical element or by engaging a concave-convex structure with a matchedconcave-convex structure of the adjacent optical element. Therefore, itis favorable for satisfying concentricity requirement of the imaginglens system so as to improve assembly yield rate under narrow assemblytolerance. Moreover, the adjacent optical element may be a lens element,a light-blocking element, an aperture stop, a stop, a spacer, aretainer, etc., and the present disclosure is not limited thereto.Please refer to FIG. 8, which shows a schematic view of the axialconnection structures 214 a, 214 b and 214 c according to the 2ndembodiment of the present disclosure. Please refer to FIG. 24 and FIG.25, which show schematic views of the axial connection structure 514 aaccording to the 5th embodiment of the present disclosure.

The plastic lens element can have a trimmed surface located at a sidethereof close to the outer annular surface. The trimmed surface isconnected to the outer annular surface. A distance between the trimmedsurface and the optical axis is smaller than a distance between theouter annular surface and the optical axis. The plastic lens element caninclude a gate trace on the trimmed surface. Therefore, it is favorablefor preventing interference between the gate trace and the lens barrelso as to permit narrow assembly tolerance. Please refer to FIG. 1, whichshows a schematic view of the trimmed surface 115 g and the gate trace116 g according to the 1st embodiment of the present disclosure. Pleaserefer to FIG. 24 and FIG. 27, which show schematic views of the trimmedsurface 515 a and the gate trace 516 a according to the 5th embodimentof the present disclosure.

The lens barrel has an internal space for accommodating the plastic lenselement. The lens barrel includes a plate portion and a lateral wallportion. The plate portion has a light-passable hole, and the opticalaxis of the imaging lens system passes through the light-passable hole.The lateral wall portion is connected to the plate portion, and thelateral wall portion extends from the plate portion along a directionsubstantially parallel to the optical axis. The lateral wall portioncorresponds to the outer annular surface of the plastic lens element.

The light-absorbing coating layer is fixed on the outer annular surfaceof the plastic lens element and is in physical contact with the lensbarrel. The light-absorbing coating layer can be a black ink sprayinglayer formed by a fast-drying ink based on epoxy resin, a blackenedcoating layer by chemical vapor deposition, photoresistive coatinglayer, etc., and the present disclosure is not limited thereto. Thelight-absorbing coating layer has an inner surface and an outer surface.The inner surface faces and is fixed on the outer annular surface of theplastic lens element. The outer surface is opposite to the innersurface, and the outer surface is located farther away from the outerannular surface of the plastic lens element than the inner surface. Theouter surface is in physical contact with the lateral wall portion ofthe lens barrel.

The light-absorbing coating layer can extend from the outer annularsurface to the axial connection structure of the plastic lens element,and the inner surface of the light-absorbing coating layer can be fixedon the axial connection structure. By fixing the light-absorbing coatinglayer to the axial connection structure, the light-absorbing coatinglayer can be aligned with and in physical contact with the adjacentoptical element, thereby preventing non-imaging light from emitting froma joint between the plastic lens element and the adjacent opticalelement via the axial connection structure, and also obtaining a properbalance between the overall concentricity requirement of the imaginglens system and the light-blocking requirement of the axial connectionstructure. Please refer to FIG. 8, which shows a schematic view of thelight-absorbing coating layer 23 b extending from the outer annularsurface 213 b to the axial connection structure 214 b of the second lenselement 21 b according to the 2nd embodiment of the present disclosure.

The light-absorbing coating layer can extend from the outer annularsurface to the object-side surface and the image-side surface of theplastic lens element, and the inner surface of the light-absorbingcoating layer can be fixed on the object-side surface and the image-sidesurface. Therefore, it is favorable for extending the light-blockingrange of the light-absorbing coating layer so as to replace the samelight-blocking function of an adjacent optical element, thereby reducingmanufacturing cost. Please refer to FIG. 8 and FIG. 10, which showschematic views of the light-absorbing coating layer 23 b extending fromthe outer annular surface 213 b to the object-side surface 211 b and theimage-side surface 212 b of the second lens element 21 b according tothe 2nd embodiment of the present disclosure.

The light-absorbing coating layer can extend from the outer annularsurface to one of the object-side surface and the image-side surface ofthe plastic lens element, and the inner surface of the light-absorbingcoating layer can be fixed on the one of the object-side surface and theimage-side surface. Therefore, it is favorable for extending thelight-blocking range of the light-absorbing coating layer so as toensure the stray light blocking efficiency out of the optical effectivearea. Please refer to FIG. 5 and FIG. 6, which show schematic views ofthe light-absorbing coating layer 13 g extending from the outer annularsurface 113 g to the object-side surface 111 g of the seventh lenselement 11 g according to the 1st embodiment of the present disclosure.Please refer to FIG. 19 and FIG. 20, which show schematic views of thelight-absorbing coating layer 43 h extending from the outer annularsurface 413 h to the image-side surface 412 h of the eighth lens element41 h according to the 4th embodiment of the present disclosure. Pleaserefer to FIG. 30 and FIG. 31, which show schematic views of thelight-absorbing coating layer 63 b extending from the outer annularsurface 613 b to the image-side surface 612 b of the second lens element61 b according to the 6th embodiment of the present disclosure.

The light-absorbing coating layer can extend from the outer annularsurface of the plastic lens element and can be fixed on at least one ofthe object-side surface and the image-side surface of the plastic lenselement, and the outer surface at a section of the light-absorbingcoating layer fixed on the at least one of the object-side surface andthe image-side surface of the plastic lens element can be in physicalcontact with an adjacent optical element. Therefore, it is favorable forsatisfying the light-blocking requirement in optical design so as toincrease image clarity.

When a length of the outer surface of the light-absorbing coating layerthat is in physical contact with the lateral wall portion of the lensbarrel along a direction substantially in parallel with the optical axisis LA, and a length of the inner surface of the light-absorbing coatinglayer along a direction substantially in parallel with the optical axisis LT, the following condition is satisfied: 0.1≤LA/LT≤0.95. Pleaserefer to FIG. FIG. 5, which shows a schematic view of LA and LTaccording to the 1st embodiment of the present disclosure.

When the light-absorbing coating layer is in physical contact with thelateral wall portion of the lens barrel by fixing the light-absorbingcoating layer on the outer annular surface of the plastic lens element,and the abovementioned condition of LA/LT is satisfied, it is favorablefor reducing the intensity of non-imaging light reflected off the outerannular surface so as to improve image quality. Also, it is favorablefor providing tolerance adjustment between the outer annular surface ofthe plastic lens element and the lens barrel in the assembling processof the imaging lens system through the thickness of the light-absorbingcoating layer that is in physical contact with the lens barrel, therebyincreasing assembly yield rate.

When a minimum thickness of a section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA1, and a thickness of a section of the light-absorbing coating layerfixed on the object-side surface or the image-side surface of theplastic lens element is dC, the following condition can be satisfied:0.97<dA1/dC≤2.5. Therefore, it is favorable for precisely controllingthe ratio range of the thickness of the light-absorbing coating layer.Please refer to FIG. 5 and FIG. 6, which show schematic views of dA1 anddC according to the 1st embodiment of the present disclosure.

When the minimum thickness of the section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA1, a maximum thickness of the section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA2, a difference between the maximum thickness dA2 and the minimumthickness dA1 is ΔdA, and the thickness of the section of thelight-absorbing coating layer fixed on the object-side surface or theimage-side surface of the plastic lens element is dC, the followingcondition can be satisfied: 0.03<ΔdA/dC<0.79. Therefore, it is favorablefor increasing the controllability range of the light-absorbing coatinglayer in the manufacturing process. Please refer to FIG. 5 and FIG. 6,which show schematic views of dA1, dA2 and dC according to the 1stembodiment of the present disclosure.

When the minimum thickness of the section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA1, the maximum thickness of the section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA2, and the difference between the maximum thickness dA2 and theminimum thickness dA1 is ΔdA, the following condition can be satisfied:0.1 [um]<ΔdA<dA1. Therefore, it is favorable for ensuring the thicknessdeviation of the light-absorbing coating layer in the manufacturingprocess, thereby increasing manufacturing yield rate.

When the minimum thickness of the section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA1, the maximum thickness of the section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA2, and the difference between the maximum thickness dA2 and theminimum thickness dA1 is ΔdA, the following condition can be satisfied:0.03<ΔdA/dA1<0.99. Therefore, it is favorable for further increasing thecontrollability range of the light-absorbing coating layer in themanufacturing process.

According to the present disclosure, the imaging lens system can furtherinclude an auxiliary light-absorbing coating layer. The auxiliarylight-absorbing coating layer has an inner surface and an outer surface.The inner surface of the auxiliary light-absorbing coating layer can befixed on the gate trace, and the outer surface of the auxiliarylight-absorbing coating layer is spaced apart from the lens barrel.Therefore, it is favorable for satisfying the light-blocking requirementat the position of the gate trace so as to increase optical quality.Please refer to FIG. 27 and FIG. 28, which show schematic views of theauxiliary light-absorbing coating layer 54 according to the 5thembodiment of the present disclosure, wherein the inner surface 541 ofthe auxiliary light-absorbing coating layer 54 is fixed on the gatetrace 516 a, and the outer surface 542 of the auxiliary light-absorbingcoating layer 54 is spaced apart from the lens barrel 52.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

Please refer to FIG. 1 to FIG. 6, where FIG. 1 is a perspective view ofan imaging lens system that is partially sectioned according to the 1stembodiment of the present disclosure, FIG. 2 is an exploded view of theimaging lens system in FIG. 1, FIG. 3 is a cross-sectional view of theimaging lens system in FIG. 2, FIG. 4 is a cross-sectional view of aseventh lens element of the imaging lens system in FIG. 3, FIG. 5 is anenlarged view of the AA region of the imaging lens system in FIG. 3, andFIG. 6 is an enlarged view of the BB region of the imaging lens systemin FIG. 5.

This embodiment provides an imaging lens system 1 that has an objectside 101, an image side 102, an image surface 103 and an optical axis104. The image side 102 is opposite to the object side 101. The imagesurface 103 is located close to the image side 102 and away from theobject side 101, and the imaging lens system 1 images on the imagesurface 103. The optical axis 104 passes through the object side 101,the image side 102 and the image surface 103. The imaging lens system 1includes a plurality of plastic lens elements 11, a plurality oflight-blocking elements LB1, a plurality of spacers SP1, a retainer RT,a lens barrel 12 and a light-absorbing coating layer 13 g.

The plastic lens elements 11 include a first lens element 11 a, a secondlens element 11 b, a third lens element 11 c, a fourth lens element 11d, a fifth lens element 11 e, a sixth lens element 11 f, a seventh lenselement 11 g and an eighth lens element 11 h. The light-blockingelements LB1 include a first light-blocking element LB11, a secondlight-blocking element LB12, a third light-blocking element LB13, afourth light-blocking element LB14, a fifth light-blocking element LB15and a sixth light-blocking element LB16. The spacers SP1 include a firstspacer SP11 and a second spacer SP12. The plastic lens elements 11, thelight-blocking elements LB1, the spacers SP1 and the retainer RT arearranged along a direction in parallel with the optical axis 104 inorder from the object side 101 to the image side 102 as follows: thefirst lens element 11 a, the second lens element 11 b, the firstlight-blocking element LB11, the third lens element 11 c, the secondlight-blocking element LB12, the fourth lens element 11 d, the thirdlight-blocking element LB13, the fifth lens element 11 e, the fourthlight-blocking element LB14, the sixth lens element 11 f, the firstspacer SP11, the fifth light-blocking element LB15, the seventh lenselement 11 g, the second spacer SP12, the sixth light-blocking elementLB16, the eighth lens element 11 h and the retainer RT.

The seventh lens element 11 g has an object-side surface 111 g, animage-side surface 112 g and an outer annular surface 113 g. Theobject-side surface 111 g faces the object side 101 of the imaging lenssystem 1. The image-side surface 112 g faces the image side 102 of theimaging lens system 1, and the image-side surface 112 g is opposite tothe object-side surface 111 g. The outer annular surface 113 g isconnected to the object-side surface 111 g and the image-side surface112 g.

The seventh lens element 11 g has a trimmed surface 115 g located at aside thereof close to the outer annular surface 113 g. The trimmedsurface 115 g is connected to the outer annular surface 113 g. Adistance between the trimmed surface 115 g and the optical axis 104 issmaller than a distance between the outer annular surface 113 g and theoptical axis 104. The seventh lens element 11 g further includes a gatetrace 116 g on the trimmed surface 115 g.

The lens barrel 12 has an internal space 121 for accommodating theplastic lens elements 11, the light-blocking elements LB1, the spacersSP1 and the retainer RT. The lens barrel 12 includes a plate portion 122and a lateral wall portion 123. The plate portion 122 is located closeto the object side 101 of the imaging lens system 1. The plate portion112 has a light-passable hole 1221, and the optical axis 104 of theimaging lens system 1 passes through the light-passable hole 1221. Thelateral wall portion 123 is located close to the image side 102 of theimaging lens system 1. The lateral wall portion 123 is connected to theplate portion 122, and the lateral wall portion 123 extends from theplate portion 122 along a direction substantially parallel to theoptical axis 104. The lateral wall portion 123 has a plurality of stepsurfaces (not numbered) at a side thereof close to the internal space121, and the step surfaces correspond to the outer annular surface 113 gof the seventh lens element 11 g and outer annular surfaces (notnumbered) of the other plastic lens elements 11 a, 11 b, 11 c, 11 d, 11e, 11 f and 11 h.

The light-absorbing coating layer 13 g is fixed on the outer annularsurface 113 g of the seventh lens element 11 g and is in physicalcontact with the lens barrel 12. The light-absorbing coating layer 13 ghas an inner surface 131 g and an outer surface 132 g. The inner surface131 g faces and is fixed on the outer annular surface 113 g of theseventh lens element 11 g. The outer surface 132 g is opposite to theinner surface 131 g, and the outer surface 132 g is located farther awayfrom the outer annular surface 113 g of the seventh lens element 11 gthan the inner surface 131 g. The outer surface 132 g is in physicalcontact with the lateral wall portion 123 of the lens barrel 12.

The light-absorbing coating layer 13 g extends from the outer annularsurface 113 g to the object-side surface 111 g of the seventh lenselement 11 g, and some amount of the inner surface 131 g of thelight-absorbing coating layer 13 g is fixed on the object-side surface111 g. The outer surface 132 g at a section of the light-absorbingcoating layer 13 g fixed on the object-side surface 111 g of the seventhlens element 11 g is in physical contact with the fifth light-blockingelement LB15.

When a length of the outer surface 132 g of the light-absorbing coatinglayer 13 g that is in physical contact with the lateral wall portion 123of the lens barrel 12 along a direction substantially in parallel withthe optical axis 104 is LA, and a length of the inner surface 131 g of asection of the light-absorbing coating layer 13 g fixed on the outerannular surface 113 g of the seventh lens element 11 g along a directionsubstantially in parallel with the optical axis 104 is LT, the followingconditions are satisfied: LA=0.36 [mm]; LT=0.49 [mm]; and LA/LT=0.73.

When a minimum thickness of a section of the light-absorbing coatinglayer 13 g fixed on the outer annular surface 113 g of the seventh lenselement 11 g is dA1, a maximum thickness of the section of thelight-absorbing coating layer 13 g fixed on the outer annular surface113 g of the seventh lens element 11 g is dA2, a difference between themaximum thickness dA2 and the minimum thickness dA1 is ΔdA, and athickness of a section of the light-absorbing coating layer 13 g fixedon the object-side surface 111 g of the seventh lens element 11 g is dC,the following conditions are satisfied: dA1=0.016 [mm]; dA2=0.017 [mm];ΔdA=0.001 [mm]=1 [um]; dC=0.01 [mm]; dA1/dC=1.60; ΔdA<dA1; ΔdA/dA1=0.06;and ΔdA/dC=0.10.

In the description of this embodiment, the light-absorbing coating layer13 g is exemplarily disposed on the seventh lens element 11 g, and thepresent disclosure is not limited thereto. In some other embodiments,the light-absorbing coating layer may be disposed on any one of theother plastic lens elements. Also, in the description of thisembodiment, the trimmed surface 115 g and the gate trace 116 g of theseventh lens element 11 g are only exemplary, and the present disclosureis not limited thereto. In some other embodiments, any one of the otherplastic lens elements may have a trimmed surface and a gate trace.

2nd Embodiment

Please refer to FIG. 7 to FIG. 12, where FIG. 7 is a cross-sectionalview of an imaging lens system according to the 2nd embodiment of thepresent disclosure, FIG. 8 is an enlarged view of the CC region of theimaging lens system in FIG. 7, FIG. 9 is an enlarged view of the DDregion of the imaging lens system in FIG. 8, FIG. 10 is an enlarged viewof the EE region of the imaging lens system in FIG. 8, FIG. 11 is anenlarged view of the FF region of the imaging lens system in FIG. 8, andFIG. 12 is an enlarged view of the GG region of the imaging lens systemin FIG. 8.

This embodiment provides an imaging lens system 2 that has an objectside 201, an image side 202, an image surface 203 and an optical axis204. The image side 202 is opposite to the object side 201. The imagesurface 203 is located close to the image side 202 and away from theobject side 201, and the imaging lens system 2 images on the imagesurface 203. The optical axis 204 passes through the object side 201,the image side 202 and the image surface 203. The imaging lens system 2includes a plurality of plastic lens elements 21, a plurality oflight-blocking elements LB2, a plurality of spacers SP2, a retainer RT,a lens barrel 22 and a plurality of light-absorbing coating layers 23.

The plastic lens elements 21 include a first lens element 21 a, a secondlens element 21 b, a third lens element 21 c, a fourth lens element 21d, a fifth lens element 21 e, a sixth lens element 21 f, a seventh lenselement 21 g and an eighth lens element 21 h. The light-blockingelements LB2 include a first light-blocking element LB21, a secondlight-blocking element LB22, a third light-blocking element LB23, afourth light-blocking element LB24, a fifth light-blocking element LB25and a sixth light-blocking element LB26. The spacers SP2 include a firstspacer SP21 and a second spacer SP22. The plastic lens elements 21, thelight-blocking elements LB2, the spacers SP2 and the retainer RT arearranged along a direction in parallel with the optical axis 204 inorder from the object side 201 to the image side 202 as follows: thefirst lens element 21 a, the second lens element 21 b, the firstlight-blocking element LB21, the third lens element 21 c, the secondlight-blocking element LB22, the fourth lens element 21 d, the thirdlight-blocking element LB23, the fifth lens element 21 e, the fourthlight-blocking element LB24, the sixth lens element 21 f, the firstspacer SP21, the fifth light-blocking element LB25, the seventh lenselement 21 g, the second spacer SP22, the sixth light-blocking elementLB26, the eighth lens element 21 h and the retainer RT.

The first lens element 21 a has an object-side surface 211 a, animage-side surface 212 a and an outer annular surface 213 a. Theobject-side surface 211 a faces the object side 201 of the imaging lenssystem 2. The image-side surface 212 a faces the image side 202 of theimaging lens system 2, and the image-side surface 212 a is opposite tothe object-side surface 211 a. The outer annular surface 213 a isconnected to the object-side surface 211 a and the image-side surface212 a.

The first lens element 21 a includes an axial connection structure 214 alocated on the image-side surface 212 a. The axial connection structure214 a is connected to the second lens element 21 b.

The second lens element 21 b has an object-side surface 211 b, animage-side surface 212 b and an outer annular surface 213 b. Theobject-side surface 211 b faces the object side 201 of the imaging lenssystem 2. The image-side surface 212 b faces the image side 202 of theimaging lens system 2, and the image-side surface 212 b is opposite tothe object-side surface 211 b. The outer annular surface 213 b isconnected to the object-side surface 211 b and the image-side surface212 b.

The second lens element 21 b includes two axial connection structures214 b respectively located on the object-side surface 211 b and theimage-side surface 212 b. The axial connection structures 214 b areconnected to the first lens element 21 a, the first light-blockingelement LB21 and the third lens element 21 c. The axial connectionstructure 214 a of the first lens element 21 a is engaged with one ofthe axial connection structures 214 b that is located on the object-sidesurface 211 b of the second lens element 21 b, such that the first lenselement 21 a and the second lens element 21 b are aligned with theoptical axis 204.

The third lens element 21 c has an object-side surface 211 c, animage-side surface 212 c and an outer annular surface 213 c. Theobject-side surface 211 c faces the object side 201 of the imaging lenssystem 2. The image-side surface 212 c faces the image side 202 of theimaging lens system 2, and the image-side surface 212 c is opposite tothe object-side surface 211 c. The outer annular surface 213 c isconnected to the object-side surface 211 c and the image-side surface212 c.

The third lens element 21 c includes two axial connection structures 214c respectively located on the object-side surface 211 c and theimage-side surface 212 c. The axial connection structures 214 c areconnected to the first light-blocking element LB21, the second lenselement 21 b, the second light-blocking element LB22 and the fourth lenselement 21 d. One of the axial connection structures 214 b that islocated on the image-side surface 212 b of the second lens element 21 bis engaged with the outer edge of the first light-blocking element LB21and one of the axial connection structures 214 c that is located on theobject-side surface 211 c of the third lens element 21 c, such that thesecond lens element 21 b, the first light-blocking element LB21 and thethird lens element 21 c are aligned with the optical axis 204. One ofthe axial connection structures 214 c that is located on the image-sidesurface 212 c of the third lens element 21 c is engaged with the outeredge of the second light-blocking element LB22 and the fourth lenselement 21 d, such that the third lens element 21 c, the secondlight-blocking element LB22 and the fourth lens element 21 d are alignedwith the optical axis 204.

The lens barrel 22 has an internal space 221 for accommodating theplastic lens elements 21, the light-blocking elements LB2, the spacersSP2 and the retainer RT. The lens barrel 22 includes a plate portion 222and a lateral wall portion 223. The plate portion 222 is located closeto the object side 201 of the imaging lens system 2. The plate portion222 has a light-passable hole 2221, and the optical axis 204 of theimaging lens system 2 passes through the light-passable hole 2221. Thelateral wall portion 223 is located close to the image side 202 of theimaging lens system 2. The lateral wall portion 223 is connected to theplate portion 222, and the lateral wall portion 223 extends from theplate portion 222 along a direction substantially parallel to theoptical axis 204. The lateral wall portion 223 has a plurality of stepsurfaces (not numbered) at a side thereof close to the internal space221, and the step surfaces correspond to the outer annular surface 213 aof the first lens element 21 a, the outer annular surface 213 b of thesecond lens element 21 b, the outer annular surface 213 c of the thirdlens element 21 c and outer annular surfaces (not numbered) of the otherplastic lens elements 21 d, 21 e, 21 f, 21 g and 21 h.

The light-absorbing coating layers 23 include a light-absorbing coatinglayer 23 a, a light-absorbing coating layer 23 b and a light-absorbingcoating layer 23 c.

The light-absorbing coating layer 23 a is fixed on the outer annularsurface 213 a of the first lens element 21 a and is in physical contactwith the lens barrel 22. The light-absorbing coating layer 23 a has aninner surface 231 a and an outer surface 232 a. The inner surface 231 afaces and is fixed on the outer annular surface 213 a of the first lenselement 21 a. The outer surface 232 a is opposite to the inner surface231 a, and the outer surface 232 a is located farther away from theouter annular surface 213 a of the first lens element 21 a than theinner surface 231 a. The outer surface 232 a is in physical contact withthe lateral wall portion 223 of the lens barrel 22.

When a length of the outer surface 232 a of the light-absorbing coatinglayer 23 a that is in physical contact with the lateral wall portion 223of the lens barrel 22 along a direction substantially in parallel withthe optical axis 204 is LA, and a length of the inner surface 231 a of asection of the light-absorbing coating layer 23 a fixed on the outerannular surface 213 a of the first lens element 21 a along a directionsubstantially in parallel with the optical axis 204 is LT, the followingconditions are satisfied: LA=0.39 [mm]; LT=0.46 [mm]; and LA/LT=0.85.

When a minimum thickness of a section of the light-absorbing coatinglayer 23 a fixed on the outer annular surface 213 a of the first lenselement 21 a is dA1, a maximum thickness of the section of thelight-absorbing coating layer 23 a fixed on the outer annular surface213 a of the first lens element 21 a is dA2, and a difference betweenthe maximum thickness dA2 and the minimum thickness dA1 is ΔdA, thefollowing conditions are satisfied: dA1=0.002 [mm]; dA2=0.003 [mm];ΔdA=0.001 [mm]=1 [um]; ΔdA<dA1; and ΔdA/dA1=0.50.

The light-absorbing coating layer 23 b is fixed on the outer annularsurface 213 b of the second lens element 21 b and is in physical contactwith the lens barrel 22. The light-absorbing coating layer 23 b has aninner surface 231 b and an outer surface 232 b. The inner surface 231 bfaces and is fixed on the outer annular surface 213 b of the second lenselement 21 b. The outer surface 232 b is opposite to the inner surface231 b, and the outer surface 232 b is located farther away from theouter annular surface 213 b of the second lens element 21 b than theinner surface 231 b. The outer surface 232 b is in physical contact withthe lateral wall portion 223 of the lens barrel 22.

The light-absorbing coating layer 23 b extends from the outer annularsurface 213 b to the object-side surface 211 b, the image-side surface212 b and the axial connection structures 214 b located on theobject-side surface 211 b and the image-side surface 212 b of the secondlens element 21 b, and some amount of the inner surface 231 b of thelight-absorbing coating layer 23 b is fixed on the object-side surface211 b, the image-side surface 212 b and the axial connection structures214 b located on the object-side surface 211 b and the image-sidesurface 212 b. The outer surface 232 b at a section of thelight-absorbing coating layer 23 b fixed on the object-side surface 211b of the second lens element 21 b is in physical contact with the firstlens element 21 a. The outer surface 232 b at a section of thelight-absorbing coating layer 23 b fixed on the image-side surface 212 bof the second lens element 21 b is in physical contact with the firstlight-blocking element LB21 and the third lens element 21 c.

When a length of the outer surface 232 b of the light-absorbing coatinglayer 23 b that is in physical contact with the lateral wall portion 223of the lens barrel 22 along a direction substantially in parallel withthe optical axis 204 is LA, and a length of the inner surface 231 b of asection of the light-absorbing coating layer 23 b fixed on the outerannular surface 213 b of the second lens element 21 b along a directionsubstantially in parallel with the optical axis 204 is LT, the followingconditions are satisfied: LA=0.35 [mm]; LT=0.43 [mm]; and LA/LT=0.81.

When a minimum thickness of a section of the light-absorbing coatinglayer 23 b fixed on the outer annular surface 213 b of the second lenselement 21 b is dA1, a maximum thickness of the section of thelight-absorbing coating layer 23 b fixed on the outer annular surface213 b of the second lens element 21 b is dA2, a difference between themaximum thickness dA2 and the minimum thickness dA1 is ΔdA, and athickness of a section of the light-absorbing coating layer 23 b fixedon the object-side surface 211 b or the image-side surface 212 b of thesecond lens element 21 b is dC, the following conditions are satisfied:dA1=0.021 [mm]; dA2=0.022 [mm]; ΔdA=0.001 [mm]=1 [um]; dC=0.02 or 0.01[mm]; dA1/dC=1.05 or 2.1; ΔdA<dA1; ΔdA/dA1=0.05; and ΔdA/dC=0.05 or0.10.

The light-absorbing coating layer 23 c is fixed on the outer annularsurface 213 c of the third lens element 21 c and is in physical contactwith the lens barrel 22. The light-absorbing coating layer 23 c has aninner surface 231 c and an outer surface 232 c. The inner surface 231 cfaces and is fixed on the outer annular surface 213 c of the third lenselement 21 c. The outer surface 232 c is opposite to the inner surface231 c, and the outer surface 232 c is located farther away from theouter annular surface 213 c of the third lens element 21 c than theinner surface 231 c. The outer surface 232 c is in physical contact withthe lateral wall portion 223 of the lens barrel 22.

When a length of the outer surface 232 c of the light-absorbing coatinglayer 23 c that is in physical contact with the lateral wall portion 223of the lens barrel 22 along a direction substantially in parallel withthe optical axis 204 is LA, and a length of the inner surface 231 c of asection of the light-absorbing coating layer 23 c fixed on the outerannular surface 213 c of the third lens element 21 c along a directionsubstantially in parallel with the optical axis 204 is LT, the followingconditions are satisfied: LA=0.37 [mm]; LT=0.44 [mm]; and LA/LT=0.84.

When a minimum thickness of a section of the light-absorbing coatinglayer 23 c fixed on the outer annular surface 213 c of the third lenselement 21 c is dA1, a maximum thickness of the section of thelight-absorbing coating layer 23 c fixed on the outer annular surface213 c of the third lens element 21 c is dA2, and a difference betweenthe maximum thickness dA2 and the minimum thickness dA1 is ΔdA, thefollowing conditions are satisfied: dA1=0.005 [mm]; dA2=0.006 [mm];ΔdA=0.001 [mm]=1 [um]; ΔdA<dA1; and ΔdA/dA1=0.20.

In the description of this embodiment, the light-absorbing coatinglayers 23 a, 23 b and 23 c are exemplarily respectively disposed on thefirst lens element 21 a, the second lens element 21 b and the third lenselement 21 c, and the present disclosure is not limited thereto. In someother embodiments, each of the light-absorbing coating layers may bedisposed on any one of the other plastic lens elements.

3rd Embodiment

Please refer to FIG. 13 to FIG. 17, where FIG. 13 is a cross-sectionalview of an imaging lens system according to the 3rd embodiment of thepresent disclosure, FIG. 14 is an enlarged view of the HH region of theimaging lens system in FIG. 13, FIG. 15 is an enlarged view of the IIregion of the imaging lens system in FIG. 14, FIG. 16 is an enlargedview of the JJ region of the imaging lens system in FIG. 14, and FIG. 17is an enlarged view of the KK region of the imaging lens system in FIG.14.

This embodiment provides an imaging lens system 3 that has an objectside 301, an image side 302, an image surface 303 and an optical axis304. The image side 302 is opposite to the object side 301. The imagesurface 303 is located close to the image side 302 and away from theobject side 301, and the imaging lens system 3 images on the imagesurface 303. The optical axis 304 passes through the object side 301,the image side 302 and the image surface 303. The imaging lens system 3includes a plurality of plastic lens elements 31, a plurality oflight-blocking elements LB3, a plurality of spacers SP3, a retainer RT,a lens barrel 32 and a plurality of light-absorbing coating layers 33.

The plastic lens elements 31 include a first lens element 31 a, a secondlens element 31 b, a third lens element 31 c, a fourth lens element 31d, a fifth lens element 31 e, a sixth lens element 31 f, a seventh lenselement 31 g and an eighth lens element 31 h. The light-blockingelements LB3 include a first light-blocking element LB31, a secondlight-blocking element LB32, a third light-blocking element LB33, afourth light-blocking element LB34, a fifth light-blocking element LB35and a sixth light-blocking element LB36. The spacers SP3 include a firstspacer SP31 and a second spacer SP32. The plastic lens elements 31, thelight-blocking elements LB3, the spacers SP3 and the retainer RT arearranged along a direction in parallel with the optical axis 304 inorder from the object side 301 to the image side 302 as follows: thefirst lens element 31 a, the second lens element 31 b, the firstlight-blocking element LB31, the third lens element 31 c, the secondlight-blocking element LB32, the fourth lens element 31 d, the thirdlight-blocking element LB33, the fifth lens element 31 e, the fourthlight-blocking element LB34, the sixth lens element 31 f, the firstspacer SP31, the fifth light-blocking element LB35, the seventh lenselement 31 g, the second spacer SP32, the sixth light-blocking elementLB36, the eighth lens element 31 h and the retainer RT.

The fourth lens element 31 d has an object-side surface 311 d, animage-side surface 312 d and an outer annular surface 313 d. Theobject-side surface 311 d faces the object side 301 of the imaging lenssystem 3. The image-side surface 312 d faces the image side 302 of theimaging lens system 3, and the image-side surface 312 d is opposite tothe object-side surface 311 d. The outer annular surface 313 d isconnected to the object-side surface 311 d and the image-side surface312 d.

The fifth lens element 31 e has an object-side surface 311 e, animage-side surface 312 e and an outer annular surface 313 e. Theobject-side surface 311 e faces the object side 301 of the imaging lenssystem 3. The image-side surface 312 e faces the image side 302 of theimaging lens system 3, and the image-side surface 312 e is opposite tothe object-side surface 311 e. The outer annular surface 313 e isconnected to the object-side surface 311 e and the image-side surface312 e.

The sixth lens element 31 f has an object-side surface 311 f, animage-side surface 312 f and an outer annular surface 313 f. Theobject-side surface 311 f faces the object side 301 of the imaging lenssystem 3. The image-side surface 312 f faces the image side 302 of theimaging lens system 3, and the image-side surface 312 f is opposite tothe object-side surface 311 f. The outer annular surface 313 f isconnected to the object-side surface 311 f and the image-side surface312 f.

The lens barrel 32 has an internal space 321 for accommodating theplastic lens elements 31, the light-blocking elements LB3, the spacersSP3 and the retainer RT. The lens barrel 32 includes a plate portion 322and a lateral wall portion 323. The plate portion 322 is located closeto the object side 301 of the imaging lens system 3. The plate portion322 has a light-passable hole 3221, and the optical axis 304 of theimaging lens system 3 passes through the light-passable hole 3221. Thelateral wall portion 323 is located close to the image side 302 of theimaging lens system 3. The lateral wall portion 323 is connected to theplate portion 322, and the lateral wall portion 323 extends from theplate portion 322 along a direction substantially parallel to theoptical axis 304. The lateral wall portion 323 has a plurality of stepsurfaces (not numbered) at a side thereof close to the internal space321, and the step surfaces correspond to the outer annular surface 313 dof the fourth lens element 31 d, the outer annular surface 313 e of thefifth lens element 31 e, the outer annular surface 313 f of the sixthlens element 31 f and outer annular surfaces (not numbered) of the otherplastic lens elements 31 a, 31 b, 31 c, 31 g and 31 h.

The light-absorbing coating layers 33 include a light-absorbing coatinglayer 33 d, a light-absorbing coating layer 33 e and a light-absorbingcoating layer 33 f.

The light-absorbing coating layer 33 d is fixed on the outer annularsurface 313 d of the fourth lens element 31 d and is in physical contactwith the lens barrel 32. The light-absorbing coating layer 33 d has aninner surface 331 d and an outer surface 332 d. The inner surface 331 dfaces and is fixed on the outer annular surface 313 d of the fourth lenselement 31 d. The outer surface 332 d is opposite to the inner surface331 d, and the outer surface 332 d is located farther away from theouter annular surface 313 d of the fourth lens element 31 d than theinner surface 331 d. The outer surface 332 d is in physical contact withthe lateral wall portion 323 of the lens barrel 32.

When a length of the outer surface 332 d of the light-absorbing coatinglayer 33 d that is in physical contact with the lateral wall portion 323of the lens barrel 32 along a direction substantially in parallel withthe optical axis 304 is LA, and a length of the inner surface 331 d of asection of the light-absorbing coating layer 33 d fixed on the outerannular surface 313 d of the fourth lens element 31 d along a directionsubstantially in parallel with the optical axis 304 is LT, the followingconditions are satisfied: LA=0.37 [mm]; LT=0.48 [mm]; and LA/LT=0.77.

When a minimum thickness of a section of the light-absorbing coatinglayer 33 d fixed on the outer annular surface 313 d of the fourth lenselement 31 d is dA1, a maximum thickness of the section of thelight-absorbing coating layer 33 d fixed on the outer annular surface313 d of the fourth lens element 31 d is dA2, and a difference betweenthe maximum thickness dA2 and the minimum thickness dA1 is ΔdA, thefollowing conditions are satisfied: dA1=0.007 [mm]; dA2=0.008 [mm];ΔdA=0.001 [mm]=1 [um]; ΔdA<dA1; and ΔdA/dA1=0.14.

The light-absorbing coating layer 33 e is fixed on the outer annularsurface 313 e of the fifth lens element 31 e and is in physical contactwith the lens barrel 32. The light-absorbing coating layer 33 e has aninner surface 331 e and an outer surface 332 e. The inner surface 331 efaces and is fixed on the outer annular surface 313 e of the fifth lenselement 31 e. The outer surface 332 e is opposite to the inner surface331 e, and the outer surface 332 e is located farther away from theouter annular surface 313 e of the fifth lens element 31 e than theinner surface 331 e. The outer surface 332 e is in physical contact withthe lateral wall portion 323 of the lens barrel 32.

When a length of the outer surface 332 e of the light-absorbing coatinglayer 33 e that is in physical contact with the lateral wall portion 323of the lens barrel 32 along a direction substantially in parallel withthe optical axis 304 is LA, and a length of the inner surface 331 e of asection of the light-absorbing coating layer 33 e fixed on the outerannular surface 313 e of the fifth lens element 31 e along a directionsubstantially in parallel with the optical axis 304 is LT, the followingconditions are satisfied: LA=0.36 [mm]; LT=0.43 [mm]; and LA/LT=0.84.

When a minimum thickness of a section of the light-absorbing coatinglayer 33 e fixed on the outer annular surface 313 e of the fifth lenselement 31 e is dA1, a maximum thickness of the section of thelight-absorbing coating layer 33 e fixed on the outer annular surface313 e of the fifth lens element 31 e is dA2, and a difference betweenthe maximum thickness dA2 and the minimum thickness dA1 is ΔdA, thefollowing conditions are satisfied: dA1=0.009 [mm]; dA2=0.01 [mm];ΔdA=0.001 [mm]=1 [um]; ΔdA<dA1; and ΔdA/dA1=0.11.

The light-absorbing coating layer 33 f is fixed on the outer annularsurface 313 f of the sixth lens element 31 f and is in physical contactwith the lens barrel 32. The light-absorbing coating layer 33 f has aninner surface 331 f and an outer surface 332 f. The inner surface 331 ffaces and is fixed on the outer annular surface 313 f of the sixth lenselement 31 f. The outer surface 332 f is opposite to the inner surface331 f, and the outer surface 332 f is located farther away from theouter annular surface 313 f of the sixth lens element 31 f than theinner surface 331 f. The outer surface 332 f is in physical contact withthe lateral wall portion 323 of the lens barrel 32.

When a length of the outer surface 332 f of the light-absorbing coatinglayer 33 f that is in physical contact with the lateral wall portion 323of the lens barrel 32 along a direction substantially in parallel withthe optical axis 304 is LA, and a length of the inner surface 331 f of asection of the light-absorbing coating layer 33 f fixed on the outerannular surface 313 f of the sixth lens element 31 f along a directionsubstantially in parallel with the optical axis 304 is LT, the followingconditions are satisfied: LA=0.13 [mm]; LT=0.27 [mm]; and LA/LT=0.48.

When a minimum thickness of a section of the light-absorbing coatinglayer 33 f fixed on the outer annular surface 313 f of the sixth lenselement 31 f is dA1, a maximum thickness of the section of thelight-absorbing coating layer 33 f fixed on the outer annular surface313 f of the sixth lens element 31 f is dA2, and a difference betweenthe maximum thickness dA2 and the minimum thickness dA1 is ΔdA, thefollowing conditions are satisfied: dA1=0.011 [mm]; dA2=0.012 [mm];ΔdA=0.001 [mm]=1 [um]; ΔdA<dA1; and ΔdA/dA1=0.09.

In the description of this embodiment, the light-absorbing coatinglayers 33 d, 33 e and 33 f are exemplarily respectively disposed on thefourth lens element 31 d, the fifth lens element 31 e and the sixth lenselement 31 f, and the present disclosure is not limited thereto. In someother embodiments, each of the light-absorbing coating layers may bedisposed on any one of the other plastic lens elements.

4th Embodiment

Please refer to FIG. 18 to FIG. 20, where FIG. 18 is a cross-sectionalview of an imaging lens system according to the 4thd embodiment of thepresent disclosure, FIG. 19 is an enlarged view of the LL region of theimaging lens system in FIG. 18, and FIG. 20 is an enlarged view of theMM region of the imaging lens system in FIG. 19.

This embodiment provides an imaging lens system 4 that has an objectside 401, an image side 402, an image surface 403 and an optical axis404. The image side 402 is opposite to the object side 401. The imagesurface 403 is located close to the image side 402 and away from theobject side 401, and the imaging lens system 4 images on the imagesurface 403. The optical axis 404 passes through the object side 401,the image side 402 and the image surface 403. The imaging lens system 4includes a plurality of plastic lens elements 41, a plurality oflight-blocking elements LB4, a plurality of spacers SP4, a retainer RT,a lens barrel 42 and a light-absorbing coating layer 43 h.

The plastic lens elements 41 include a first lens element 41 a, a secondlens element 41 b, a third lens element 41 c, a fourth lens element 41d, a fifth lens element 41 e, a sixth lens element 41 f, a seventh lenselement 41 g and an eighth lens element 41 h. The light-blockingelements LB4 include a first light-blocking element LB41, a secondlight-blocking element LB42, a third light-blocking element LB43, afourth light-blocking element LB44, a fifth light-blocking element LB45and a sixth light-blocking element LB46. The spacers SP4 include a firstspacer SP41 and a second spacer SP42. The plastic lens elements 41, thelight-blocking elements LB4, the spacers SP4 and the retainer RT arearranged along a direction in parallel with the optical axis 404 inorder from the object side 401 to the image side 402 as follows: thefirst lens element 41 a, the second lens element 41 b, the firstlight-blocking element LB41, the third lens element 41 c, the secondlight-blocking element LB42, the fourth lens element 41 d, the thirdlight-blocking element LB43, the fifth lens element 41 e, the fourthlight-blocking element LB44, the sixth lens element 41 f, the firstspacer SP41, the fifth light-blocking element LB45, the seventh lenselement 41 g, the second spacer SP42, the sixth light-blocking elementLB46, the eighth lens element 41 h and the retainer RT.

The eighth lens element 41 h has an object-side surface 411 h, animage-side surface 412 h and an outer annular surface 413 h. Theobject-side surface 411 h faces the object side 401 of the imaging lenssystem 4. The image-side surface 412 h faces the image side 402 of theimaging lens system 4, and the image-side surface 412 h is opposite tothe object-side surface 411 h. The outer annular surface 413 h isconnected to the object-side surface 411 h and the image-side surface412 h.

The lens barrel 42 has an internal space 421 for accommodating theplastic lens elements 41, the light-blocking elements LB4, the spacersSP4 and the retainer RT. The lens barrel 42 includes a plate portion 422and a lateral wall portion 423. The plate portion 422 is located closeto the object side 401 of the imaging lens system 4. The plate portion422 has a light-passable hole 4221, and the optical axis 404 of theimaging lens system 4 passes through the light-passable hole 4221. Thelateral wall portion 423 is located close to the image side 402 of theimaging lens system 4. The lateral wall portion 423 is connected to theplate portion 422, and the lateral wall portion 423 extends from theplate portion 422 along a direction substantially parallel to theoptical axis 404. The lateral wall portion 423 has a plurality of stepsurfaces (not numbered) at a side thereof close to the internal space421, and the step surfaces correspond to the outer annular surface 413 hof the eighth lens element 41 h and outer annular surfaces (notnumbered) of the other plastic lens elements 41 a, 41 b, 41 c, 41 d, 41e, 41 f and 41 g.

The light-absorbing coating layer 43 h is fixed on the outer annularsurface 413 h of the eighth lens element 41 h and is in physical contactwith the lens barrel 42. The light-absorbing coating layer 43 h has aninner surface 431 h and an outer surface 432 h. The inner surface 431 hfaces and is fixed on the outer annular surface 413 h of the eighth lenselement 41 h. The outer surface 432 h is opposite to the inner surface431 h, and the outer surface 432 h is located farther away from theouter annular surface 413 h of the eighth lens element 41 h than theinner surface 431 h. The outer surface 432 h is in physical contact withthe lateral wall portion 423 of the lens barrel 42.

The light-absorbing coating layer 43 h extends from the outer annularsurface 413 h to the image-side surface 412 h of the eighth lens element41 h, and some amount of the inner surface 431 h of the light-absorbingcoating layer 43 h is fixed on the image-side surface 412 h. The outersurface 432 h at a section of the light-absorbing coating layer 43 hfixed on the image-side surface 412 h of the eighth lens element 41 h isin physical contact with the retainer RT.

When a length of the outer surface 432 h of the light-absorbing coatinglayer 43 h that is in physical contact with the lateral wall portion 423of the lens barrel 42 along a direction substantially in parallel withthe optical axis 404 is LA, and a length of the inner surface 431 h of asection of the light-absorbing coating layer 43 h fixed on the outerannular surface 413 h of the eighth lens element 41 h along a directionsubstantially in parallel with the optical axis 404 is LT, the followingconditions are satisfied: LA=0.44 [mm]; LT=0.52 [mm]; and LA/LT=0.85.

When a minimum thickness of a section of the light-absorbing coatinglayer 43 h fixed on the outer annular surface 413 h of the eighth lenselement 41 h is dA1, a maximum thickness of the section of thelight-absorbing coating layer 43 h fixed on the outer annular surface413 h of the eighth lens element 41 h is dA2, a difference between themaximum thickness dA2 and the minimum thickness dA1 is ΔdA, and athickness of a section of the light-absorbing coating layer 43 h fixedon the image-side surface 412 h of the eighth lens element 41 h is dC,the following conditions are satisfied: dA1=0.009 [mm]; dA2=0.01 [mm];ΔdA=0.001 [mm]=1 [um]; dC=0.01 [mm]; dA1/dC=0.90; ΔdA<dA1; ΔdA/dA1=0.11;and ΔdA/dC=0.10.

In the description of this embodiment, the light-absorbing coating layer43 h is exemplarily disposed on the eighth lens element 41 h, and thepresent disclosure is not limited thereto. In some other embodiments,the light-absorbing coating layer may be disposed on any one of theother plastic lens elements.

5th Embodiment

Please refer to FIG. 21 to FIG. 28, where FIG. 21 is a cross-sectionalview of an imaging lens system according to the 5th embodiment of thepresent disclosure, FIG. 22 is a perspective view of the imaging lenssystem in FIG. 21 that is partially sectioned, FIG. 23 is across-sectional view of the imaging lens system in FIG. 22, FIG. 24 is across-sectional view of a first lens element of the imaging lens systemin FIG. 23, FIG. 25 is an enlarged view of the NN region of the imaginglens system in 23, FIG. 26 is an enlarged view of the OO region of theimaging lens system in 25, FIG. 27 is an enlarged view of the PP regionof the imaging lens system in 23, and FIG. 28 is an enlarged view of theQQ region of the imaging lens system in 27.

This embodiment provides an imaging lens system 5 that has an objectside 501, an image side 502, an image surface 503 and an optical axis504. The image side 502 is opposite to the object side 501. The imagesurface 503 is located close to the image side 502 and away from theobject side 501, and the imaging lens system 5 images on the imagesurface 503. The optical axis 504 passes through the object side 501,the image side 502 and the image surface 503. The imaging lens system 5includes a retainer RT, a plurality of plastic lens elements 51, a lensbarrel 52 and a light-absorbing coating layer 53 a.

The plastic lens elements 51 include a first lens element 51 a, a secondlens element 51 b and a third lens element 51 c. The retainer RT and theplastic lens elements 51 are arranged along a direction in parallel withthe optical axis 504 in order from the object side 501 to the image side502 as follows: the retainer RT, the first lens element 51 a, the secondlens element 51 b and the third lens element 51 c.

The first lens element 51 a has an object-side surface 511 a, animage-side surface 512 a and an outer annular surface 513 a. Theobject-side surface 511 a faces the object side 501 of the imaging lenssystem 5. The image-side surface 512 a faces the image side 502 of theimaging lens system 5, and the image-side surface 512 a is opposite tothe object-side surface 511 a. The outer annular surface 513 a isconnected to the object-side surface 511 a and the image-side surface512 a.

The first lens element 51 a includes an axial connection structure 514 alocated on the image-side surface 512 a. The axial connection structure514 a is connected to the second lens element 51 b. The axial connectionstructure 514 a is engaged with the second lens element 51 b, such thatthe first lens element 51 a and the second lens element 51 b are alignedwith the optical axis 504.

The first lens element 51 a has a trimmed surface 515 a located at aside thereof close to the outer annular surface 513 a. The trimmedsurface 515 a is connected to the outer annular surface 513 a. Adistance between the trimmed surface 515 a and the optical axis 504 issmaller than a distance between the outer annular surface 513 a and theoptical axis 504. The first lens element 51 a further includes a gatetrace 516 a on the trimmed surface 515 a.

The lens barrel 52 has an internal space 521 for accommodating theplastic lens elements 51 and the retainer RT. The lens barrel 52includes a plate portion 522 and a lateral wall portion 523. The plateportion 522 is located close to the object side 501 of the imaging lenssystem 5. The plate portion 522 has a light-passable hole 5221, and theoptical axis 504 of the imaging lens system 5 passes through thelight-passable hole 5221. The lateral wall portion 523 is located closeto the image side 502 of the imaging lens system 5. The lateral wallportion 523 is connected to the plate portion 522, and the lateral wallportion 523 extends from the plate portion 522 along a directionsubstantially parallel to the optical axis 504. The lateral wall portion523 has a plurality of step surfaces (not numbered) at a side thereofclose to the internal space 521, and the step surfaces correspond to theouter annular surface 513 a of the first lens element 51 a and outerannular surfaces (not numbered) of the other plastic lens elements 51 band 51 c.

The light-absorbing coating layer 53 a is fixed on the outer annularsurface 513 a of the first lens element 51 a and is in physical contactwith the lens barrel 52. The light-absorbing coating layer 53 a has aninner surface 531 a and an outer surface 532 a. The inner surface 531 afaces and is fixed on the outer annular surface 513 a of the first lenselement 51 a. The outer surface 532 a is opposite to the inner surface531 a, and the outer surface 532 a is located farther away from theouter annular surface 513 a of the first lens element 51 a than theinner surface 531 a. The outer surface 532 a is in physical contact withthe lateral wall portion 523 of the lens barrel 52.

When a length of the outer surface 532 a of the light-absorbing coatinglayer 53 a that is in physical contact with the lateral wall portion 523of the lens barrel 52 along a direction substantially in parallel withthe optical axis 504 is LA, and a length of the inner surface 531 a of asection of the light-absorbing coating layer 53 a fixed on the outerannular surface 513 a of the first lens element 51 a along a directionsubstantially in parallel with the optical axis 504 is LT, the followingconditions are satisfied: LA=0.27 [mm]; LT=0.31 [mm]; and LA/LT=0.87.

When a minimum thickness of a section of the light-absorbing coatinglayer 53 a fixed on the outer annular surface 513 a of the first lenselement 51 a is dA1, a maximum thickness of the section of thelight-absorbing coating layer 53 a fixed on the outer annular surface513 a of the first lens element 51 a is dA2, and a difference betweenthe maximum thickness dA2 and the minimum thickness dA1 is ΔdA, thefollowing conditions are satisfied: dA1=0.009 [mm]; dA2=0.01 [mm];ΔdA=0.001 [mm]=1 [urn]; ΔdA<dA1; and ΔdA/dA1=0.11.

The imaging lens system 5 further includes an auxiliary light-absorbingcoating layer 54. The auxiliary light-absorbing coating layer 54 has aninner surface 541 and an outer surface 542. The inner surface 541 of theauxiliary light-absorbing coating layer 54 is fixed on the gate trace516 a, and the outer surface 542 of the auxiliary light-absorbingcoating layer 54 is spaced apart from the lens barrel 52. As such, theauxiliary light-absorbing coating layer 54 and the light-absorbingcoating layer 53 a can be connected to each other and thus can bemanufactured together in the same process.

In the description of this embodiment, the light-absorbing coating layer53 a is exemplarily disposed on the first lens element 51 a, and thepresent disclosure is not limited thereto. In some other embodiments,the light-absorbing coating layer may be disposed on any one of theother plastic lens elements. Also, in the description of thisembodiment, the trimmed surface 515 a and the gate trace 516 a of thefirst lens element 51 a are only exemplary, and the present disclosureis not limited thereto. In some other embodiments, any one of the otherplastic lens elements may have a trimmed surface and a gate trace.

6th Embodiment

Please refer to FIG. 29 to FIG. 31, where FIG. 29 is a cross-sectionalview of an imaging lens system according to the 6th embodiment of thepresent disclosure, FIG. 30 is an enlarged view of the RR region of theimaging lens system in FIG. 29, and FIG. 31 is an enlarged view of theSS region of the imaging lens system in FIG. 30.

This embodiment provides an imaging lens system 6 that has an objectside 601, an image side 602, an image surface 603 and an optical axis604. The image side 602 is opposite to the object side 601. The imagesurface 603 is located close to the image side 602 and away from theobject side 601, and the imaging lens system 6 images on the imagesurface 603. The optical axis 604 passes through the object side 601,the image side 602 and the image surface 603. The imaging lens system 6includes a retainer RT, a plurality of plastic lens elements 61, a lensbarrel 62 and a light-absorbing coating layer 63 b.

The plastic lens elements 61 include a first lens element 61 a, a secondlens element 61 b and a third lens element 61 c. The retainer RT and theplastic lens elements 61 are arranged along a direction in parallel withthe optical axis 604 in order from the object side 601 to the image side602 as follows: the retainer RT, the first lens element 61 a, the secondlens element 61 b and the third lens element 61 c.

The second lens element 61 b has an object-side surface 611 b, animage-side surface 612 b and an outer annular surface 613 b. Theobject-side surface 611 b faces the object side 601 of the imaging lenssystem 6. The image-side surface 612 b faces the image side 602 of theimaging lens system 6, and the image-side surface 612 b is opposite tothe object-side surface 611 b. The outer annular surface 613 b isconnected to the object-side surface 611 b and the image-side surface612 b.

The lens barrel 62 has an internal space 621 for accommodating theplastic lens elements 61 and the retainer RT. The lens barrel 62includes a plate portion 622 and a lateral wall portion 623. The plateportion 622 is located close to the object side 601 of the imaging lenssystem 6. The plate portion 622 has a light-passable hole 6221, and theoptical axis 604 of the imaging lens system 6 passes through thelight-passable hole 6221. The lateral wall portion 623 is located closeto the image side 602 of the imaging lens system 6. The lateral wallportion 623 is connected to the plate portion 622, and the lateral wallportion 623 extends from the plate portion 622 along a directionsubstantially parallel to the optical axis 604. The lateral wall portion623 has a plurality of step surfaces (not numbered) at a side thereofclose to the internal space 621, and the step surfaces correspond to theouter annular surface 613 b of the second lens element 61 b and outerannular surfaces (not numbered) of the other plastic lens elements 61 aand 61 c.

The light-absorbing coating layer 63 b is fixed on the outer annularsurface 613 b of the second lens element 61 b and is in physical contactwith the lens barrel 62. The light-absorbing coating layer 63 b has aninner surface 631 b and an outer surface 632 b. The inner surface 631 bfaces and is fixed on the outer annular surface 613 b of the second lenselement 61 b. The outer surface 632 b is opposite to the inner surface631 b, and the outer surface 632 b is located farther away from theouter annular surface 613 b of the second lens element 61 b than theinner surface 631 b. The outer surface 632 b is in physical contact withthe lateral wall portion 623 of the lens barrel 62.

The light-absorbing coating layer 63 b extends from the outer annularsurface 613 b to the image-side surface 612 b of the second lens element61 b, and some amount of the inner surface 631 b of the light-absorbingcoating layer 63 b is fixed on the image-side surface 612 b. The outersurface 632 b at a section of the light-absorbing coating layer 63 bfixed on the image-side surface 612 b of the second lens element 61 b isin physical contact with the third lens element 61 c.

When a length of the outer surface 632 b of the light-absorbing coatinglayer 63 b that is in physical contact with the lateral wall portion 623of the lens barrel 62 along a direction substantially in parallel withthe optical axis 604 is LA, and a length of the inner surface 631 b of asection of the light-absorbing coating layer 63 b fixed on the outerannular surface 613 b of the second lens element 61 b along a directionsubstantially in parallel with the optical axis 604 is LT, the followingconditions are satisfied: LA=1.23 [mm]; LT=1.87 [mm]; and LA/LT=0.66.

When a minimum thickness of a section of the light-absorbing coatinglayer 63 b fixed on the outer annular surface 613 b of the second lenselement 61 b is dA1, a maximum thickness of the section of thelight-absorbing coating layer 63 b fixed on the outer annular surface613 b of the second lens element 61 b is dA2, a difference between themaximum thickness dA2 and the minimum thickness dA1 is ΔdA, and athickness of a section of the light-absorbing coating layer 63 b fixedon the image-side surface 612 b of the second lens element 61 b is dC,the following conditions are satisfied: dA1=0.01 [mm]; dA2=0.024 [mm];ΔdA=0.014 [mm]=14 [um]; dC=0.03 or 0.02 [mm]; dA1/dC=0.33 or 0.50;ΔdA<dA1; ΔdA/dA1=1.4; and ΔdA/dC=0.47 or 0.70.

In the description of this embodiment, the light-absorbing coating layer63 b is exemplarily disposed on the second lens element 61 b and thepresent disclosure is not limited thereto. In some other embodiments,the light-absorbing coating layer may be disposed on any one of theother plastic lens elements.

7th Embodiment

FIG. 32 is a perspective view of a camera module according to the 7thembodiment of the present disclosure. In this embodiment, a cameramodule 7 includes the imaging lens system 1 disclosed in the 1stembodiment, a driving device 71, an image sensor 72 and an imagestabilizer 73. The imaging lens system 1 includes the plastic lenselements 11, the light-blocking elements LB1, the spacers SP1, theretainer RT, the lens barrel 12 and the light-absorbing coating layer 13g that are disclosed in the 1st embodiment, and also includes a holdermember (not shown) for holding the plastic lens elements. However, thecamera module 7 may alternatively be provided with any one of theimaging lens systems 2-6 disclosed in other abovementioned embodiments,and the present disclosure is not limited thereto. The imaging lightconverges in the imaging lens system 1 of the camera module 7 togenerate an image with the driving device 71 utilized for image focusingon the image sensor 72, and the generated image is then digitallytransmitted to other electronic component for further processing.

The driving device 71 can have auto focusing functionality, anddifferent driving configurations can be obtained through the usages ofvoice coil motors (VCM), micro electro-mechanical systems (MEMS),piezoelectric systems, or shape memory alloy materials. The drivingdevice 71 is favorable for obtaining a better imaging position of theimaging lens system 1, so that a clear image of the imaged object can becaptured by the imaging lens system 1 with different object distances.The image sensor 72 (for example, CCD or CMOS), which can feature highphotosensitivity and low noise, is disposed on the image surface of theimaging lens system 1 to provide higher image quality.

The image stabilizer 73, such as an accelerometer, a gyro sensor and aHall Effect sensor, is configured to work with the driving device 71 toprovide optical image stabilization (01S). The driving device 71 workingwith the image stabilizer 73 is favorable for compensating for pan andtilt of the imaging lens system 1 to reduce blurring associated withmotion during exposure. In some cases, the compensation can be providedby electronic image stabilization (EIS) with image processing software,thereby improving image quality while in motion or low-light conditions.

8th Embodiment

FIG. 33 is a perspective view of an electronic device according to the8th embodiment of the present disclosure. FIG. 34 is another perspectiveview of the electronic device in FIG. 33. FIG. 35 is a block diagram ofthe electronic device in FIG. 33.

In this embodiment, an electronic device 8 is a smartphone including thecamera module 7 disclosed in the 7th embodiment, a camera module 7 a, acamera module 7 b, a camera module 7 c, a camera module 7 d, a flashmodule 81, a focus assist module 82, an image signal processor 83, auser interface 84 and an image software processor 85. The camera module7 and the camera module 7 a are disposed on the same side of theelectronic device 8 and each of the camera modules 7 and 7 a has asingle focal point. The camera module 7 b, the camera module 7 c, thecamera module 7 d and the user interface 84 are disposed on the oppositeside of the electronic device 8 and the user interface 84 is a displayunit, such that the camera modules 7 b, 7 c, 7 d can be front-facingcameras of the electronic device 8 for taking selfies, but the presentdisclosure is not limited thereto. Furthermore, each of the cameramodules 7 a, 7 b, 7 c and 7 d can include any one of the imaging lenssystems 1-6 of the present disclosure and can have a configurationsimilar to that of the camera module 7. In detail, each of the cameramodules 7 a, 7 b, 7 c and 7 d can include an imaging lens system, adriving device, an image sensor and an image stabilizer, and each of theimaging lens system can include a plastic lens element, a light-blockingelement, a spacer, a retainer, a lens barrel and a light-absorbingcoating layer that are disclosed in the abovementioned embodiments, anda holder member for holding the plastic lens element.

The camera module 7 is a wide-angle camera module, the camera module 7 ais an ultra-wide-angle camera module, the camera module 7 b is awide-angle camera module, the camera module 7 c is an ultra-wide-anglecamera module, and the camera module 7 d is a ToF (time of flight)camera module. In this embodiment, the camera modules 7, 7 a havedifferent fields of view, such that the electronic device 8 can havevarious magnification ratios so as to meet the requirement of opticalzoom functionality. In addition, the camera module 7 d can determinedepth information of the imaged object. In this embodiment, theelectronic device 8 includes multiple camera modules 7, 7 a, 7 b, 7 cand 7 d, but the present disclosure is not limited to the number andarrangement of camera modules.

When a user captures images of an object 86, the light rays converge inthe camera module 7 or the camera module 7 a to generate images, and theflash module 81 is activated for light supplement. The focus assistmodule 82 detects the object distance of the imaged object 86 to achievefast auto focusing. The image signal processor 83 is configured tooptimize the captured image to improve image quality. The light beamemitted from the focus assist module 82 can be either conventionalinfrared or laser. In addition, the light rays may converge in thecamera module 7 b, 7 c or 7 d to generate images. The user interface 84can include a touch screen, and the user is able to interact with theuser interface 84 and the image software processor 85 having multiplefunctions to capture images and complete image processing.Alternatively, the user may capture images via a physical button. Theimage processed by the image software processor 85 can be displayed onthe user interface 84.

The smartphone in these embodiments is only exemplary for showing theimaging lens systems 1-6 of the present disclosure installed in theelectronic device 8, and the present disclosure is not limited thereto.The imaging lens systems 1-6 can be optionally applied to opticalsystems with a movable focus. Furthermore, the imaging lens systems 1-6feature good capability in aberration corrections and high imagequality, and can be applied to 3D image capturing applications, inproducts such as digital cameras, mobile devices, digital tablets, smarttelevisions, network surveillance devices, dashboard cameras, vehiclebackup cameras, multi-camera devices, image recognition systems, motionsensing input devices, wearable devices and other electronic imagingdevices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatthe present disclosure shows different data of the differentembodiments; however, the data of the different embodiments are obtainedfrom experiments. The embodiments were chosen and described in order tobest explain the principles of the disclosure and its practicalapplications, to thereby enable others skilled in the art to bestutilize the disclosure and various embodiments with variousmodifications as are suited to the particular use contemplated. Theembodiments depicted above and the appended drawings are exemplary andare not intended to be exhaustive or to limit the scope of the presentdisclosure to the precise forms disclosed. Many modifications andvariations are possible in view of the above teachings.

What is claimed is:
 1. An imaging lens system, having an object side, animage side and an optical axis, the image side being opposite to theobject side, the optical axis passing through the object side and theimage side, and the imaging lens system comprising: a plastic lenselement, having: an object-side surface, facing the object side of theimaging lens system; an image-side surface, facing the image side of theimaging lens system, wherein the image-side surface is opposite to theobject-side surface; and an outer annular surface, connected to theobject-side surface and the image-side surface; a lens barrel, having aninternal space for accommodating the plastic lens element, and the lensbarrel comprising: a plate portion, having a light-passable hole,wherein the optical axis of the imaging lens system passes through thelight-passable hole; and a lateral wall portion, connected to the plateportion, wherein the lateral wall portion extends from the plate portionalong a direction substantially parallel to the optical axis, and thelateral wall portion corresponds to the outer annular surface of theplastic lens element; and a light-absorbing coating layer, fixed on theouter annular surface of the plastic lens element and being in physicalcontact with the lens barrel, and the light-absorbing coating layerhaving: an inner surface, facing and being fixed on the outer annularsurface of the plastic lens element; and an outer surface, beingopposite to the inner surface, wherein the outer surface is locatedfarther away from the outer annular surface of the plastic lens elementthan the inner surface, and the outer surface is in physical contactwith the lateral wall portion of the lens barrel; wherein a length ofthe outer surface of the light-absorbing coating layer that is inphysical contact with the lateral wall portion of the lens barrel alonga direction substantially in parallel with the optical axis is LA, alength of the inner surface of the light-absorbing coating layer along adirection substantially in parallel with the optical axis is LT, and thefollowing condition is satisfied:0.1≤LA/LT≤0.95.
 2. The imaging lens system according to claim 1, whereinthe plastic lens element comprises at least one axial connectionstructure located on at least one of the object-side surface and theimage-side surface, and the at least one axial connection structure isconfigured to be connected to an adjacent optical element and to alignthe adjacent optical element with the optical axis.
 3. The imaging lenssystem according to claim 2, wherein the light-absorbing coating layerextends from the outer annular surface to the at least one axialconnection structure of the plastic lens element, and the inner surfaceof the light-absorbing coating layer is fixed on the at least one axialconnection structure.
 4. The imaging lens system according to claim 1,wherein the light-absorbing coating layer extends from the outer annularsurface to the object-side surface and the image-side surface of theplastic lens element, and the inner surface of the light-absorbingcoating layer is fixed on the object-side surface and the image-sidesurface.
 5. The imaging lens system according to claim 1, wherein thelight-absorbing coating layer extends from the outer annular surface toone of the object-side surface and the image-side surface of the plasticlens element, and the inner surface of the light-absorbing coating layeris fixed on the one of the object-side surface and the image-sidesurface.
 6. The imaging lens system according to claim 1, wherein thelight-absorbing coating layer extends from the outer annular surface andis fixed on at least one of the object-side surface and the image-sidesurface of the plastic lens element, a minimum thickness of a section ofthe light-absorbing coating layer fixed on the outer annular surface ofthe plastic lens element is dA1, a thickness of a section of thelight-absorbing coating layer fixed on the object-side surface or theimage-side surface of the plastic lens element is dC, and the followingcondition is satisfied:0.97<dA1/dC≤2.5.
 7. The imaging lens system according to claim 6,wherein the minimum thickness of the section of the light-absorbingcoating layer fixed on the outer annular surface of the plastic lenselement is dA1, a maximum thickness of the section of thelight-absorbing coating layer fixed on the outer annular surface of theplastic lens element is dA2, a difference between the maximum thicknessdA2 and the minimum thickness dA1 is ΔdA, the thickness of the sectionof the light-absorbing coating layer fixed on the object-side surface orthe image-side surface of the plastic lens element is dC, and thefollowing condition is satisfied:0.03<ΔdA/dC<0.79.
 8. The imaging lens system according to claim 1,wherein a minimum thickness of a section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA1, a maximum thickness of the section of the light-absorbing coatinglayer fixed on the outer annular surface of the plastic lens element isdA2, a difference between the maximum thickness dA2 and the minimumthickness dA1 is ΔdA, and the following condition is satisfied:0.1 [um]<ΔdA<dA1.
 9. The imaging lens system according to claim 8,wherein the minimum thickness of the section of the light-absorbingcoating layer fixed on the outer annular surface of the plastic lenselement is dA1, the maximum thickness of the section of thelight-absorbing coating layer fixed on the outer annular surface of theplastic lens element is dA2, the difference between the maximumthickness dA2 and the minimum thickness dA1 is ΔdA, and the followingcondition is satisfied:0.03<ΔdA/dA1<0.99.
 10. The imaging lens system according to claim 1,wherein the light-absorbing coating layer extends from the outer annularsurface and is fixed on at least one of the object-side surface and theimage-side surface of the plastic lens element, and the outer surface ata section of the light-absorbing coating layer that is fixed on the atleast one of the object-side surface and the image-side surface of theplastic lens element is in physical contact with an adjacent opticalelement.
 11. The imaging lens system according to claim 1, wherein theplastic lens element has a trimmed surface located at a side thereofclose to the outer annular surface, the trimmed surface is connected tothe outer annular surface, a distance between the trimmed surface andthe optical axis is smaller than a distance between the outer annularsurface and the optical axis, and the plastic lens element comprises agate trace on the trimmed surface.
 12. The imaging lens system accordingto claim 11, further comprising an auxiliary light-absorbing coatinglayer, wherein the auxiliary light-absorbing coating layer has an innersurface and an outer surface, the inner surface of the auxiliarylight-absorbing coating layer is fixed on the gate trace, and the outersurface of the auxiliary light-absorbing coating layer is spaced apartfrom the lens barrel.
 13. A camera module, comprising: the imaging lenssystem of claim
 1. 14. An electronic device, comprising: the cameramodule of claim 13; and an image sensor, disposed on an image surface ofthe imaging lens system.